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Please find 

class="katex-mathml">δ and ϕ in the following figure:

snip.PNG

snip.PNG

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This is a simple question on reflection,... View the full answer

IMG_20200107_184044.jpg

M2
50
40
172. 4
K
50
From snell's law
M, sin ( 40 9) = 1, sin ( 72-4' )
we have ,
Hence, up sin ( 72 . 49 ) = u, sin( 3 )
7+9 = 90
From reflection rule,
- 8 = 90 - 40
w= X
8 = 40
=
8 =509
W= 40'...

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